IF......................the generators to be paralleled were identical then it's easier. IF........the governors are set up for load following or lead/lag. IF......you have the parallel switch set up into indicate the phase relationship before closing the "tie" breaker. If........you feel like spending more to have a less workable system then just purchasing the proper single large generator in the first place. A few days ago we got into this over on the "tools" board. Some cheapskates and/or heroes couldn't wait to extol the virtues of purchasing a generator barely large enough for "all they really need". The price difference to go up one or two sizes from a "just enough" generator is negligible. It costs within pennies to design, build, shipping, insurance, wages, buildings, profit margin. To build a 3500 vs 5500W machine or a 10KW vs. 15KW. Best solution would be a couple of months after the last power interruption. Is to find somebody with a short memory who wants $$$ for something else. And purchase a large enough motor or pto driven generator.
Paralleling generators is a sore point dear to myself. Me, just a fool on the tools told the engineers that paralleling our 7 MW gasturbine backup generators doesn't work. They went ahead and spent 10's of millions on a tie and control system that doesn't work. They were told it would be cheaper to purchase and install a larger dedicated 25MW FairBanks Morris medium speed diesel instead that would work. They were also asked what if the power grid ever drops like it did in the early 1960's. They laughed in my face. This was before the August 2003 blackout over the northeast. I asked them if they though they run a 5MW motor from a 7MW generator. They said it would run fine. I asked how they were going to start the 5MW from a 7MW generator? They said "easy, the 7MW generator has 2MW to spare". I asked if they knew about starting inrush current". One engineer gave me a blank look and the other thought a second then got a panicky look on his face". Last I seen they quit trying to parallel the gasturbines as they "fight like two cats in a sack". They couldn't "black start" the 5MW backup pump either from one 7MW gasturbine. It took about two seconds to find that out for themselves. The breakers closed, the ammeters pegged off scale high, the governor went max output, the exhaust stack blew black smoke, the exhaust temps started to rise, voltage dropped and frequency dropped. Then breakers and emergency shutdown relays started tripping. It got pretty quiet for a few moments as everybody looked at each other. Then the excuses and "butt covering " started. The 2003 blackout hit and the nuclear regulatory commission had a screaming fit and asked why didn't they have working backup power in case of a total power grid collapse. Two reactors had to depend on the backup to the backup of the backup system for cooling. Yes they will cool via thermosyphon just like a model T car engine. There was two more backup systems left in case b.t.w. So they went out and spent another 10's of millions to a temporary 25MW gasturbine backup genset. Then spent another 10's of millions on another permanent dedicated 25MW gasturbine system.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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